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Loans - Contractual Aging of Recorded Investment in Past Due Loans by Portfolio Classification of Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 2,460 $ 1,744  
Current 768,746 756,350  
Loans after net deferred loan fees and costs 771,206 758,094 $ 707,660
Recorded Investment > 90 Days and Accruing 0 0 0
Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 301 144  
Current 62,502 62,192  
Loans after net deferred loan fees and costs 62,803 62,336 59,479
Agricultural [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   101  
Current 87,078 84,591  
Loans after net deferred loan fees and costs 87,078 84,692 78,021
Commercial And Industrial and Industrial Development Bonds [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 121,183 115,093  
Loans after net deferred loan fees and costs 121,183 115,093 109,386
Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 984 1,404  
Current 83,097 84,469  
Loans after net deferred loan fees and costs 84,081 85,873 88,097
Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 1,118 60  
Current 381,065 376,827  
Loans after net deferred loan fees and costs 382,183 376,887 344,661
Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 57 35  
Current 33,821 33,178  
Loans after net deferred loan fees and costs 33,878 33,213 $ 28,016
30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 1,826 1,084  
30 to 59 Days Past Due [Member] | Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 169 12  
30 to 59 Days Past Due [Member] | Agricultural [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due   101  
30 to 59 Days Past Due [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 502 882  
30 to 59 Days Past Due [Member] | Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 1,118 60  
30 to 59 Days Past Due [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 37 29  
60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 54 21  
60 to 89 Days Past Due [Member] | Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 31    
60 to 89 Days Past Due [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 10 15  
60 to 89 Days Past Due [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 13 6  
Greater Than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 580 639  
Greater Than 90 Days [Member] | Agricultural Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 101 132  
Greater Than 90 Days [Member] | Consumer Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 472 $ 507  
Greater Than 90 Days [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 7